Update your plugin using the dev manifest or by downloading the release from GitHub Releases and installing it manually!
Changes since last build:
misc: Jf 10.11 userdata insertion guard (#106):
SaveUserDataForNewKey previously did a blind insert of the migrated UserData row, which would collide with Jellyfin's ReattachUserDataAsync when it tried to move tombstoned placeholder rows to the same (ItemId, UserId, CustomDataKey) slot.
This fix now deletes any conflicting placeholder row before inserting, so the reattachment has nothing to move. It also checks whether the destination already has a row and updates in place, handling the reverse case where the reattachment wins the race.